Expansion cutter-head for boring-bars.



0. M. BUGK.

EXPANSION CUTTER HEAD FOR BORING BARS APPLICATION FILED JUNE 16, 1908.

922,520 Patented; May 18, 1909.

By j hitnm State at W est Virginia,

' performing CHARLES MILTON BUOK, OF HUNTINGTON, WEST VIRGINIA.

EXPANSION CUTTER-"WEAD FQE BCRING-BAR.

T 0 all whom it may concern:

Be it known that l, Gimmes M. BUCK, a citizen of the United States, and a. resident of Huntington, in the county of Csbell and have invented a new end 1m roved Expansion Cutter-Head for Boringhis, oil which the following is a. full, clear, and exact description.

h T his invention relates to cutter heads such as used on boring hers and similar devices for boring operations.

T he device is intended esoeciolly to be used in boring the hubs of cor Wheels, though it is capable of use for other purposes.

T he object of the invention is to produce a cutter head having simple means for mounting and sdjusting the cutters therein.

The invention consists in the construction sud combination of ports to be more fully described hereinafter and particularly set forth the claims.

Reference is to he had to the accompanying drawings forming s port of this specification in which similar characters of reference indicate correspondingports in all the figuresl Figure 1 is a. sidef'elevotion' cl a. cutter heed constructed according to my invention, the lower portion of the hood being shown in cross section; 2 is a, View similer to Fig. 1, and showing the cutter hood in cross section, the section being; token in a, plane at right angles to the plane ol- Fig. 1' Fig. 3 is a bottom plan View of the cutter heed; Fig. 4 is a crosssection taken. on the line is-"i ol Fig. *3 Fig. 5 is a cross section on the line 5--5 01 Fig. 2; Fig. 6 is a.- cross section on the line 6*?) of Fig. .2; end Fig. 7 is a vertical section token otthe lower end oi the cutter head upon an enlarged scele, and especially illustinting the adjusting and for the cutters. I

Referring indrc purticulml to the parts, i reiiresents the cutter head which is in the form of a mandrel, adopted to be attached to a. boring her or boring spindle. The forward end of the cutter head, that is, the lower end, is illustrated in l igs. 1 and .2 us trovided with a, central bore 2, and in this core there is slid-ably nuyunted a wedge block 3. This wedge blocl; 3 is adjusted by moons of on adjusting screw 4 which passes into the some from the lower end, said udjusting screw being provided with o head 5 which seats against the outer face of a center plate cl sniping devices l l l I Specification of Letters Patent. Application filed. June 16, 1908. Serial No. $8,736.

1 6, and this center this Reel 21 has a square socket l j l inclined 'izices 8, 2li1ti these the rear ends of roughing; cutters 9.

Fiatented May 18,'109.

plate is seated in the low or head in u counterhore 7, as es shown in end of the cutter shown. On oiposite sides, Fig. .2, the we go block is provided with faces :tbut against These cutters project through the sides of the cutter head, passing through openings 10, as

The inclined faces i indicated, in Fig. 2. constitute the bottoms oi grooves llivliich are formed on o iposite sides oftho wedge lathe at right angles to these formed, cxtending longitudinally in the hloclt. The holtoms of these grooves are not leper-ed, and they form guides for wed or cotters 13, which p esent inclined Lres l4- s guinst the rear end of finishing cutters l These cutters are formed sillrilzflr, to the cutters 9, and project front the well ol the cutter head, passing through openings 16, as indicated in Fig. 1. Those openings 16 are midway hetweenthe openings 10 and further from tho'tsp plate 20. 'l he end oi the cutter head is threaded as indicated at 17, so as to enable toes ring 18 to he attii-cluzd.

has a. large central opening with t rubbet out groove 19, end this irnhhet groove ul'lords means for holding in position cup or cup date 20. his cop plate fits down upon the head 5 of the screw 4, as shown in Fig. 2 and beyond the head 5 the adjusting screw is torn. d withe reduced neck 21 which rotatably mounted in the cap, as will he readily understood. As shown in Fig. 3, 22 which sdoots it to be rotated hymsquore wrench. indicated in 7, the inner edge of the ring 15 projects over the outer edge of the center plate 6 so as to retain. the centerplutc in position. The wedges or cotter-s '33 are made adjustable by menus of adjusting: screws 23 which puss inlo the some through the center phi-t e ('5, and those adjusting screws are provided with enlarged heads 34, similar to the head 5, Mill disposed between the center plate 6 and the cup 20. They are also provided, with reduced necks 35, having square sockets .36 therein, see Fig. 3, which enables them to be adjusted by a square wrench, zl-S will be readily understood. In the wall of the cutter head,-longitudinally disposed screws 27 are provided, which are in. alinenrent with the cuttors,'which are block, and in u p grooves deep grooves 1:2 ure adapted to seat upon the forward edges thereof, so as to clamp the cutters rigidly in osition. These set screws have enlarged eads 28 which are rotatably mounted in the ring 18, and are formed with square sockets 29, see Fig. 3, for the application of a wrench. In order to adjust the roughing cutters 9 outwardly, it is only necessaiyto rotate the adjusting screw 4 in a left-hand direction, the screw being represented as having a right-hand thread. This rotation will advenue the wedge block 3' inwardly in the bore 2, and the inclined faces 8 will move the cutters slightly outwardly. After they are adjusted to the proper point, the set screws which engage their edges will be rotated so as to clamp the cutters rigidly in position. Attention is called to the fact that the adjustment of these cutters. 9 is entirely independent of the adjusting of the cutters 15, and either pair of cutters may be adjusted independently of the other. In order to adjust the finishing cutters 15, the adjusting screws 23 will be rotated so as to advance the cotters 13, and after the cutters 15 have been adjusted outwardly sufficiently they will be clamped r gidly in position by their corresponding set screws. In this way a very simple and easily adjusted boring bar cutter head is produced.

In considering the operation of'adjusting the cutters, attention is called. to thefunc tions of the center plated and the ca 20 block inwardly, and t which take the thrust oi the heads 0 the adjusting screws. The headset the screws thrust against the ca 2th, forcing the wedge rusta ainst the center plate 6 drawing the wedge in oak and'cotters outwardly,

' with-a air of oppositely d Having thus described my invention, I claim as new and desire to secure by Letters Patent, m I 1. A cutter head hav ng shore with opdnin s in the wall thereo" a wedge block-slidab y mounted in said ore and having inclined faces disposed oppositeto a pair ofsaid openings, roughing cutters mounted in a pail-oi said openings and seatin against said inclined faces, means for a justing said Wedge block in said bore, 'cotters mounted on the sides of said wed 'hlock'hetween said inclined faces, means'iorladjustin said 06tters, said cotters havinginclinedaces, and

finishing cutters passing. through another pair of openings and seating against said cotters. I

, 2. A cutter head Having bore therein giggled openings in the-wal of said bore, rou g cutters disposed in said openings and projecting from said cutter head, said cutter head having a second pair of openings disposed between said first olenings, finis ing cutters mounted in said ownings, awedge block ,slidably mounted said here aimfhaving inclined plate closin plate closin faces abutting the rear ends of said roughing cutters, cotters adjustably mounted .i'aces abutting the .rear faces of said finishing cutters, means for adjusting said wedge block, and independent means for adjusting said cutters.

3. A cutter head having 'a bore therein, a the end of said bore, a Wedge block slidab y mounted in said bore, an adjusting screw passing through said late and engaging said wedge block. to a just the same, cotters slidably mounted on said wedge block, adjusting screws engaging said cotters and passing through said plate, and cutters mounted in the Wall of said head engaging and adaptsaid wedge block and said cottem, ed to be adjusted outwardly thereby.

4. A cutter head having a bore therein, a the end of said bore, a wedge lock slidab y mounted insaid here, an adjusting screw assing through said plate and engaging sai wedge bloc to adjust the same, eotters slidably mounted on said wedge block, adjusting screws engagin said cotters and passing throu h said ate, cutters mounted in the we of said ead engaging said wedge block and said cutters, and ads ted to be adjusted outwardly thereby, a ring retaining said plate, and set screws passiu through said ring mounted in said cutter hea on the sides of said wedge block and having inclined and engaging said cutters to clamp the same.

5. A cutter head having a bore therein, a wedge block mounted to slide in said bore and having oppositely disposed inclined faces, cutters extending through the wall of said cutter head and en aging said inclined faces so as to be adjus ed thereby, guide grooves in the sides of said wedge block, c0tters sliding in said guide grooves and having inclined faces, cutters pro ecting through the wall of said cutter head and seating against said cotters to be adjusted thereb a center plate closing the outer end of saibore, adusting screws passing through said center just the same, other adjusting screws passinu through said center plate and engaging sai cotters to adjust the saine, means for retaining said center plate, sald cutters and means for clamping inclined faces, cutters extending through the wall of said cutter head and abutting said inclined faces, cotters guided on the sides'of said wedge block and having inclined faces, other cutters projecting through the: wall of said cutter head and abutting the inclined faces of said cotters, a center plate mounted in the end of said here, adjusting screws passing throu h said plate engaging said wedge block an said cotters respectively for ad-- justing the same, said adjusting screws havmg heads seating against said plate, a ring '8. A cutter head having a bore therein, a wedge block sliding in said bore and'having 110 late and engaging, said .wedge block to adi meunted mining sa dlsposed z'ing and mg screw mo'uzltcd 01m svdap ind ustmg said on the end 01' id piate and 2 overs s haying l'ed in. said cap, to raseive aid plat said used news r0 said necks having much for rotating 1 said cuimwneud w In 1 d by 511M ad mat-- Latahlv cup retains munv to this speciiiwltioll in two subscribilw' witnesses.

("UTAH LE5 Mil.

W iuwsses'.

TON B L UL 

